Abstract
Static and dynamic light scattering, small-angle X-ray scattering, and viscosity measurements were used to characterize solutions of polystyrene-polyisoprene AB block copolymers with constant molecular weight of polyisoprene and various molecular weights of polystyrene in aniline. Aniline is a selective solvent for polystyrene, is isorefractive with polystyrene, and also has the same electron density as polystyrene. This fact enabled us to measure independently both the core and the total size of the micelles formed. From the data, we were able to obtain a picture of the micelle structure. The hard-sphere model and a model proposed by S. Alexander ( J. Physique 38, 983 (1977)) were applied successfully to interpret the data.
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